Quick Revision

GK One-Line Question & Answer

15541+ short questions with short answers, covering every category and sub-category on the site — no long articles to scroll through. Good for a fast recap before an exam, or a few minutes of daily practice.

Looking for exam process/strategy questions instead? Try the Exam Preparation FAQ →

Computer Networks → Introduction to Computer Networks 37

What is maintenance window in networking
Scheduled time for network changes with reduced business impact
click to copy
What is peer review for network changes
Having another engineer verify change plan before implementation
click to copy
What is network lifecycle management
Planning implementing operating and retiring network infrastructure
click to copy
What is EOS (End of Support) impact
No more security patches creating vulnerabilities
click to copy
What is EOL (End of Life) hardware impact
Hardware no longer manufactured with dwindling spare parts
click to copy
What is technology refresh cycle
Planned regular replacement of aging network equipment
click to copy
What is network capacity forecasting
Predicting future bandwidth and resource needs
click to copy
What is network cost optimization
Reducing network costs while maintaining performance and reliability
click to copy
What is dark fiber
Installed but unused fiber optic cable
click to copy
What is IRU (Indefeasible Right of Use)
Long-term lease of fiber capacity (15-25 years typically)
click to copy
What is fiber exhaust
Running out of available fiber strands in a cable
click to copy
What is wavelength service vs fiber service
Wavelength leases specific lambda fiber leases entire strand
click to copy
What is colocation data center
Renting space power and cooling for own equipment
click to copy
What is network latency impact on applications
Slowing response time degrading user experience
click to copy
What is high latency impact on TCP
Slow window growth poor throughput on long-fat pipes
click to copy
What is low latency requirement for HFT
Microsecond-level latency for competitive advantage
click to copy
What is kernel bypass networking benefit
Eliminating kernel overhead for ultra-low latency
click to copy
What is FPGA in networking
Field Programmable Gate Array for custom hardware acceleration
click to copy
What is cut-through switching advantage
Lower latency by starting forward before full frame received
click to copy
What is store-and-forward switching advantage
Better error detection by receiving full frame first
click to copy
What is port-to-port latency in switch
Time to forward frame from ingress to egress port
click to copy
What is fabric latency in modular chassis
Latency traversing switch fabric between line cards
click to copy
What is oversubscription in switch
Ratio of port bandwidth to fabric bandwidth
click to copy
What is full mesh data center fabric advantage
Any-to-any connectivity with equal latency
click to copy
What is blocking vs non-blocking switch fabric
Blocking may drop frames non-blocking always has path
click to copy
What is multipath in data center benefits
Higher aggregate bandwidth and redundancy
click to copy
What is next-generation firewall (NGFW) inspection
Deep packet inspection with application awareness and IPS
click to copy
What is NGFW application control
Identifying and controlling applications regardless of port
click to copy
What is NGFW URL filtering
Categorizing and blocking websites by category
click to copy
What is NGFW sandboxing
Executing suspicious files in isolation to detect zero-days
click to copy
What is microsegmentation vs macro-segmentation
Micro is per-workload macro is per-network-zone segmentation
click to copy
What is east-west traffic in data center
Server-to-server traffic within data center
click to copy
What is north-south traffic in data center
Traffic between data center and external networks/internet
click to copy
What is service insertion in security
Inserting security function in traffic path transparently
click to copy
What is policy-based traffic steering
Directing traffic to security functions based on policy
click to copy
What is transparent mode firewall
Firewall in bridge mode requiring no IP reconfiguration
click to copy
What is routed mode firewall
Firewall acting as router with IP addresses on interfaces
click to copy

Computer Networks → Types of Networks 1

What is rollback plan in network changes
Pre-planned steps to revert if change causes problems
click to copy

Computer Networks → Network Topologies 1

What is Clos network topology
Multi-stage switching topology for non-blocking fabric
click to copy

Computer Networks → Presentation Layer 1

What is NGFW TLS inspection mode
Decrypting inspecting and re-encrypting HTTPS traffic
click to copy